From owner-freebsd-hackers  Sat Sep 15 17:53:51 2001
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Date: Sat, 15 Sep 2001 17:53:44 -0700 (PDT)
From: Matthew Jacob <mjacob@feral.com>
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To: Stephen Montgomery-Smith <stephen@math.missouri.edu>
Cc: freebsd-hackers@FreeBSD.ORG
Subject: Re: Could not bind
In-Reply-To: <3BA3F70D.27C2136@math.missouri.edu>
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You should always use perror or strerror if a system call fails so you know
*why* it fails. Then you can cross-references with the man(2) and man(3) pages
to figure out what's up.


On Sat, 15 Sep 2001, Stephen Montgomery-Smith wrote:

> I have written a server program that listens on port 3000.  The program
> works very well except for one feature.  I am asking if that is normal,
> or whether I forgot something.
> 
> If I run the program it does fine.  If I then kill the program (after it
> has accepted connections), and then run the program again, the bind
> function fails to work, and I get a message like "Could not bind" (see
> program below).  If I wait a while, like a minute or two, then the
> program will work again. Is this normal behavior, or did I miss
> something?
> 
> I got the programming style from Richard Steven's book on network
> programming.  The structure of the program is something like this:
> 
> 
> typedef struct {
>   int connfd;
>   struct in_addr addr;
>   u_short port;
> }
> arg_pass_type;
> 
> void *process_client(void *arg) {
>   int connfd = ((arg_pass_type*)arg)->connfd;
>   struct in_addr addr = ((arg_pass_type*)arg)->addr;
>   u_short port = ((arg_pass_type*)arg)->port;
> 
>   free(arg);
>   pthread_detach(pthread_self());
>   do_lots_of_stuff();
> 
> }
> 
> int main () {
>   int listenfd;
>   struct sockaddr_in servaddr;
>   socklen_t slen;
>   pthread_t tid;
>   arg_pass_type *arg;
> 
>   listenfd=socket(AF_INET,SOCK_STREAM,0);
>   bzero(&servaddr,sizeof(servaddr));
>   servaddr.sin_family=AF_INET;
>   servaddr.sin_addr.s_addr=htonl(INADDR_ANY);
>   servaddr.sin_port=htons(3000);
>   if (bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr)) < 0)
>   {
>     fprintf(stderr,"Could not bind\n");
>     exit(1);
>   }
>   listen(listenfd,6);
> 
>   while (1)
>   {
>     slen=sizeof(servaddr);
>     arg = malloc(sizeof(arg_pass_type));
>     arg->connfd = accept(listenfd,(struct sockaddr*)&servaddr,&slen);
>     arg->addr = servaddr.sin_addr;
>     arg->port = servaddr.sin_port;
>     pthread_create(&tid,NULL,process_client,(void*) arg);
>   }
>   exit(0);
> }
> 
> -- 
> Stephen Montgomery-Smith
> stephen@math.missouri.edu
> http://www.math.missouri.edu/~stephen
> 
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